That I agree with. Notice how all the photos are taken at the same angles as well. The SAC is noticeably stricter with regulation around the air field.
J-20 and J-31 pictures all are leaked pictures, the main difference between cultures and political systems are self evident in the way you know about each stealth fighter from each nation.
If you want to know about F-22 you just need to go to Lockheed Martin`s webpage or watch a discovery channel documentary, the Discovery Channel had video of YF-22 since the early 1990s.
Same is T-50 PAKFA, just go to Sukhoi`s webpage or watch video from RT, or any Russian TV channel.
With China you see leaked pictures or allowing plane spotters take the pictures and upload them on the internet.
Why the difference?
Very likely the difference is because both Russia and the US are the largest exporters of fighter aircraft, so for Russia releasing some data is good, plus Russia today is not comunist, in the years of the USSR only pictures taken on military parades or satellite pictures were the most likely source of pictures of Russian military hardware.
China is far more open than the USSR was, but mostly because we live in the times of Internet.
The Chinese use less official venues than the USA and Russia, but more or less all these nations release the information for political and economic reasons.
The Chinese seem less willing to release official information about their programs, because this could show weakness of their aircraft.
Russia and the US usually boast, the americans usually say the best fighter of the world, the Russians now say the same things, China is unwilling to boast openly, but they also boast in a less self evident way
